public void testCombineUnordered() {
HashCode hash31 = HashCodes.fromInt(31);
HashCode hash32 = HashCodes.fromInt(32);
assertEquals(hash32, Hashing.combineUnordered(ImmutableList.of(hash32)));
assertEquals(HashCodes.fromInt(64), Hashing.combineUnordered(ImmutableList.of(hash32, hash32)));
assertEquals(
HashCodes.fromInt(96), Hashing.combineUnordered(ImmutableList.of(hash32, hash32, hash32)));
assertEquals(
Hashing.combineUnordered(ImmutableList.of(hash31, hash32)),
Hashing.combineUnordered(ImmutableList.of(hash32, hash31)));
}
public void testCombineOrdered() {
HashCode hash31 = HashCodes.fromInt(31);
HashCode hash32 = HashCodes.fromInt(32);
assertEquals(hash32, Hashing.combineOrdered(ImmutableList.of(hash32)));
assertEquals(
HashCodes.fromBytes(new byte[] {(byte) 0x80, 0, 0, 0}),
Hashing.combineOrdered(ImmutableList.of(hash32, hash32)));
assertEquals(
HashCodes.fromBytes(new byte[] {(byte) 0xa0, 0, 0, 0}),
Hashing.combineOrdered(ImmutableList.of(hash32, hash32, hash32)));
assertFalse(
Hashing.combineOrdered(ImmutableList.of(hash31, hash32))
.equals(Hashing.combineOrdered(ImmutableList.of(hash32, hash31))));
}
public void testCombineUnordered_differentBitLengths() {
try {
Hashing.combineUnordered(ImmutableList.of(HashCodes.fromInt(32), HashCodes.fromLong(32L)));
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testConsistentHash_ofHashCode() {
checkSameResult(HashCodes.fromLong(1), 1);
checkSameResult(HashCodes.fromLong(0x9999999999999999L), 0x9999999999999999L);
checkSameResult(HashCodes.fromInt(0x99999999), 0x0000000099999999L);
}
public void testPadToLong() {
assertEquals(0x1111111111111111L, Hashing.padToLong(HashCodes.fromLong(0x1111111111111111L)));
assertEquals(0x9999999999999999L, Hashing.padToLong(HashCodes.fromLong(0x9999999999999999L)));
assertEquals(0x0000000011111111L, Hashing.padToLong(HashCodes.fromInt(0x11111111)));
assertEquals(0x0000000099999999L, Hashing.padToLong(HashCodes.fromInt(0x99999999)));
}
